<language> A restriction of ALGOL 68 permitting one-pass compilation,
developed at the Royal Signals Radar Establishment, Malvern, Worcester, UK in
Identifiers, modes and operators must be declared before use. There is no
automatic proceduring and no concurrency. It was implemented in ALGOL 60 under
GEORGE 3 on an ICL 1907F.
["ALGOL 68-R, Its Implementation and Use", I.F. Currie et al, Proc IFIP Congress
1971, N-H 1971, pp. 360-363].
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